Mechanism for transmitting reciprocating motion.



' D. ROBERTS. MECHANISM FOR TRANSMITTING REGIPROGATING MOTION. APPLICATION FILED AUG. 26, 1909.

975,283}. Patented Nov. 8, 1910.

3 SHEETS-SHEET 1.

D. ROBERTS. MECHANISM FOR TRANSMITTING RBGIPROUATING MOTION.

APPLICATION FILED AUG.26, 1909.

Patented Nov. 8, 1910.

3 SHEETS-SHEET 2.

Kbfvngzmlvr 1 G 4 V r A D. ROBERTS. MECHANISM FOR TRANSMITTING REOIPROGATING MOTION.

APPLICATION FILED AUG. 26, 1909.

Patented Nov. 8,1910.

3 SHEETS-SHEET 3.

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Wl'lnesses gwfm We??? DAVID ROBERTS, GRANTHAM, ENGLAND.

mncnnmsm ron TRANSMITTING RECIPROCATING incision.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed August 26, 1909. Serial No. 514,801.

, great rapidity as for example, is the case 'with pumps employed for the injection of hydrocarbon fuel into the Vaporizers or combustion chambers of internal combustion engines.

In the case of umps of the type above referred to contro has usually been efl'ected by a cam or eccentric actuating a striker, either directly or through the medium of a lever or levers, slack or lost motion being providedbetween it or them and the pump plunger so that only that portion of the face of the cam, or only that part of the travel of the eccentric which gives the quickest motion.

is made use of to operate the pump on the forming stroke, and the length of stroke or quantity of liquid pumped being governed mechanically by opening a by-pass valve at any suitablepoint in the forcing stroke. It is found in practice that this mode of operation when applied to quick running pumps working against resistance, gives rise to shock'and is noisy owing to the slack or lost motion between the str1ker.or plunger beingItaken up suddenlyl ow, my invention has for its object to obviate this defect and to this end it consists in taking up the said slack or lost motion by mechanical means suitably interposed between the striker and pump plunger. The mechanical means employed may assume different forms, and in the accompanying drawing I have illustrated several different modifications. A

In the said drawing :Figure l is a sectional elevation of one form of mechanism for carrying out my invention and shown applied to a pump plunger. Figs. 2 and 3 are views similar to Fig. 1 showing the parts in different positions. Figs. 4 and 5 are similar views of a' modified form of mechanism, and Figs. 6 and 7, 8 and 9 and 10 and 11 are similar views of still further modifications.

In the form of the invention illustrated in Figs. 1, 2, and 3 the slack or lost motion is taken up by links. a represents the operating cam, b is the pump plunger striker, 0 its guide, 03 the spring which holds it up to .the cam a, e is the pump plunger, and f the pump plunger guide. g is the stop against which the plunger 6 comes to rest at the end of its suction stroke, and h is the spring by which the plunger e is operated on its suction stroke. 4 j is a link connected at one end to the striker b by the pin is, and at the other end by-the pin Z to the link m, which link is connected to the pump plunger 6 by the pin 12. In Fig. 1 the pump plunger '0 is shown at the end of the suction stroke and the striker b in its highest position, the cam a. being on the point of commencing to move the striker b downward, Fig. 2 shows the cam a and striker I) 'just commencing the forcing stroke of the plunger 6' through the medium of the links j and m which have been brought into alinement during-the time of thedescent of the striker from the position shown in Fig. l to that shown inFig. 2. Fig. 3 shows the striker b and plunger e at the end of the forcing stroke. On the-return or suction stroke, which is effected by the springs d and h when the'plunger comes to rest on the stop 9, the links is and m reassume the position shown in Fig. 1 under the'action of the spring 0. This spring is coiled around the rod p which is pivoted at one end to the link m and is housed with the spring in the box 9' hinged at 'r to a fixed bracket 1. The arrangement or position ofparts may be reversed by changing the position of theplunger and striker, that is to say by connecting the link 7' to the pump plunger e and the link m to the striker b.

Figs. 4 and 5 show an alternative method of ta king up the slack or lost motion. In this construction the end of the pump strikerb is formed with a flat surface s, and the pump plunger 6 with a double inclined surface 27.

Between the surfaces 8 and t are interposed two rollers'u, u which are connected together by toggle links w and pins :20 under the action of springs y. The operation of this form of my invention-is as follows :As the striker b descends from the'position shown in Fig. 4 the rollers it run down the inclined faces t until they reach the position shown in Fig. 5, when they are restrained from further outward movement by the toggle links 10. On the upward or suction stroke the toggle links reassume their original position when the plunger comes to rest on the stop 9 under the action of the springs 3 Figs. 6 and 7 illustrate a construction similar to that shown in Figs. 4 and 5. In this case the striker b and the plunger 0 are formed with flat surfaces 8 and t respectively between which are located two wedges a and b which are superposed and slide on each other, the outward movement being restrained by toggle links and springs as in the construction shown in Figs. 4 and 5.

Figs. 8 and 9 illustrate an arrangement similar to that shown in Figs. 4 and 5- but in which the toggle links w are dispensed with, while the arrangement shown in Figs. 10 and 11 is similar to that shown in Figs. 8 and 9 except that one roller u and one in-' clined face t are dispensed with, the roller 'uem' loyed being connected by the spring y to a xed bracket a.

All the above arrangements are shown .operated by a cam a but it will be obvious 'that in lieu of the cam I may make use of an eccentric, and rod; also that I may in some cases use a radius rod in place of the plunger guide in which case the roller operated by the cam, and the link may be attached to the free end of the radius rod by one and the same pin.

Although I have above particularly de-. scribed and illustratedv my invention as applied to pumpsit is to be clearly understood;

that it is also applicable to valve and other devices in which the same form of reciprocating motion is required.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is 1. The combination with a striker, and means for reciprocating it, of a part separated from the striker and positively actuated thereby at each reciprocation thereof, the separation of said parts providing lost motion between the said parts at each reciprocation of the striker, and devices int-erposed between said parts for taking up the lost motion, comprising parts movable transversely of the line of movement of the striker, and a yielding device connected therewith to resist said transverse movement, whereby ateach reciprocation of the striker the actuated partwill be positively actuated by the striker through a shorter range of movement after-the lost motion is taken up.

2. The combination with a reciprocating striker, of a reciprocatin plunger in line therewith and separate therefrom and having a shorter-range of movement than the striker, the separation of said parts providing a predetermined amount of lost motion between said parts at each reciprocation of the striker, devices interposed between the striker and plunger for taking up the lost motion, adapted to be moved laterally at each operation of the striker, and a spring connected with said devices to resist the lateral movement thereof, whereby the plunger will be positively actuated by the striker, through ashorter range of movement than that of the striker, after the lost motion is taken up, at each reciprocation of the striker.

3. The combination with a reciprocating striker, of a reciprocating plunger in line therewith separated therefrom and having a shorter range of movement than the striker, the separation of the parts providing a predetermined amount ofvlost motion between them at each reciprocation of the striker, connections for positively transmitting motion from the striker to the plunger at each reciprocation of the striker, having laterally movable portions to take up said lost motion, and a spring connected with said connections to resist said lateral movement thereof.

4. The combination with a reciprocating plunger, of a reciprocating striker in line therewith, means for giving said striker a longer reciprocation than the plunger at each operation of the same, a link pivotally connected to the plunger, a second-link piv-' otally connected to the striker and to the first mentioned link, said second link being longer than the distance between the points of connection of said links with the striker and plunger, and a spring operatively connected with said links adjacent to their point of pivoting to each other, and exerting a pressure-thereon in a direction away from said striker and plunger.

5. The combination with a reciprocating striker, of a reciprocating plunger in line therewith separated therefrom and having a shorter range of movement than the striker, the separation of said parts providing a predetermined amount of lost motion between them at each reciprocation of the striker, movable mechanical devices interposed between the striker and plunger, constructed to take up said lost motion, and to be operated at. each reciprocation of the DAVID ROBERTS. \Vitnesses i \VALTER HAY vns, 1 -SAMUEL WInLIAM PAYNE. 

